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Overview
| Comment: | Fix potential memory leaks in the misc 'compress' extension. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 3bc34fd427d9d7819cd9740237b1f5d4 |
| User & Date: | mistachkin 2015-02-26 21:04:44 |
Context
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2015-02-27
| ||
| 00:33 | Add a couple of requirements marks. check-in: d70b0fd4 user: drh tags: trunk | |
|
2015-02-26
| ||
| 21:04 | Fix potential memory leaks in the misc 'compress' extension. check-in: 3bc34fd4 user: mistachkin tags: trunk | |
| 16:40 | Update a requirements mark to reflect a change of wording in the documentation. No changes to code. check-in: 3038d016 user: drh tags: trunk | |
Changes
Changes to ext/misc/compress.c.
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sqlite3_value **argv
){
const unsigned char *pIn;
unsigned char *pOut;
unsigned int nIn;
unsigned long int nOut;
unsigned char x[8];
int i, j;
pIn = sqlite3_value_blob(argv[0]);
nIn = sqlite3_value_bytes(argv[0]);
nOut = 13 + nIn + (nIn+999)/1000;
pOut = sqlite3_malloc( nOut+5 );
for(i=4; i>=0; i--){
x[i] = (nIn >> (7*(4-i)))&0x7f;
}
for(i=0; i<4 && x[i]==0; i++){}
for(j=0; i<=4; i++, j++) pOut[j] = x[i];
pOut[j-1] |= 0x80;
compress(&pOut[j], &nOut, pIn, nIn);
sqlite3_result_blob(context, pOut, nOut+j, sqlite3_free);
}
/*
** Implementation of the "uncompress(X)" SQL function. The argument X
** is a blob which was obtained from compress(Y). The output will be
** the value Y.
*/
................................................................................
nOut = (nOut<<7) | (pIn[i]&0x7f);
if( (pIn[i]&0x80)!=0 ){ i++; break; }
}
pOut = sqlite3_malloc( nOut+1 );
rc = uncompress(pOut, &nOut, &pIn[i], nIn-i);
if( rc==Z_OK ){
sqlite3_result_blob(context, pOut, nOut, sqlite3_free);
}
}
#ifdef _WIN32
__declspec(dllexport)
#endif
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sqlite3_value **argv
){
const unsigned char *pIn;
unsigned char *pOut;
unsigned int nIn;
unsigned long int nOut;
unsigned char x[8];
int rc;
int i, j;
pIn = sqlite3_value_blob(argv[0]);
nIn = sqlite3_value_bytes(argv[0]);
nOut = 13 + nIn + (nIn+999)/1000;
pOut = sqlite3_malloc( nOut+5 );
for(i=4; i>=0; i--){
x[i] = (nIn >> (7*(4-i)))&0x7f;
}
for(i=0; i<4 && x[i]==0; i++){}
for(j=0; i<=4; i++, j++) pOut[j] = x[i];
pOut[j-1] |= 0x80;
rc = compress(&pOut[j], &nOut, pIn, nIn);
if( rc==Z_OK ){
sqlite3_result_blob(context, pOut, nOut+j, sqlite3_free);
}else{
sqlite3_free(pOut);
}
}
/*
** Implementation of the "uncompress(X)" SQL function. The argument X
** is a blob which was obtained from compress(Y). The output will be
** the value Y.
*/
................................................................................
nOut = (nOut<<7) | (pIn[i]&0x7f);
if( (pIn[i]&0x80)!=0 ){ i++; break; }
}
pOut = sqlite3_malloc( nOut+1 );
rc = uncompress(pOut, &nOut, &pIn[i], nIn-i);
if( rc==Z_OK ){
sqlite3_result_blob(context, pOut, nOut, sqlite3_free);
}else{
sqlite3_free(pOut);
}
}
#ifdef _WIN32
__declspec(dllexport)
#endif
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